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@ -41,6 +41,13 @@
Fix <a class="link" href="reference/decay.html" title="decay">decay</a> to follow
C++11 semantics, see <a href="https://svn.boost.org/trac/boost/ticket/7760" target="_top">#7760</a>.
</li>
<li class="listitem">
Added a number of new traits <a class="link" href="reference/is_assignable.html" title="is_assignable">is_assignable</a>,
<a class="link" href="reference/is_default_constructible.html" title="is_default_constructible">is_default_constructible</a>,
<a class="link" href="reference/is_constructible.html" title="is_constructible">is_constructible</a>
and <a class="link" href="reference/is_destructible.html" title="is_destructible">is_destructible</a>
required to fix bugs in a number of other traits, see for example <a href="https://svn.boost.org/trac/boost/ticket/7760" target="_top">#11324</a>.
</li>
</ul></div>
<h5>
<a name="boost_typetraits.history.h1"></a>

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<div class="section" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_typetraits.reference.common_type_hpp"></a><a class="link" href="common_type_hpp.html" title="common_type"> common_type</a>
</h3></div></div></div>
<p>
<code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">common_type</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="special">...</span><span class="identifier">T</span><span class="special">&gt;</span> <span class="keyword">struct</span> <a class="link" href="../../">common_type</a><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
<a class="link" href="../../">common_type</a>
is a traits class used to deduce a type common to a several types, useful
as the return type of functions operating on multiple input types such as
in mixed-mode arithmetic..
</p>
<p>
The nested typedef <code class="computeroutput"><span class="special">::</span><span class="identifier">type</span></code>
could be defined as follows:
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="special">...</span><span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">common_type</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">,</span> <span class="keyword">class</span> <span class="special">...</span><span class="identifier">V</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span><span class="identifier">U</span><span class="special">,...</span><span class="identifier">V</span><span class="special">&gt;</span> <span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">__common_type__</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">__common_type__</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="identifier">V</span><span class="special">...&gt;::</span><span class="identifier">type</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span> <span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">T</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">common_type</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">decltype</span><span class="special">(</span><span class="identifier">__declval__</span><span class="special">&lt;</span><span class="keyword">bool</span><span class="special">&gt;()</span> <span class="special">?</span> <span class="identifier">__declval__</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;()</span> <span class="special">:</span> <span class="identifier">__declval__</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;())</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
All parameter types must be complete. This trait is permitted to be specialized
by a user if at least one template parameter is a user-defined type. <span class="bold"><strong>Note:</strong></span> Such specializations are required when only
explicit conversions are desired among the <a class="link" href="../../">common_type</a>
arguments.
</p>
<a name="boost_typetraits.reference.common_type_hpp.configuration_macros"></a><h5>
<a name="id895242"></a>
<a class="link" href="common_type_hpp.html#boost_typetraits.reference.common_type_hpp.configuration_macros">Configuration
macros</a>
</h5>
<p>
When the compiler does not support static assertions then the user can select
the way static assertions are reported. Define
</p>
<div class="itemizedlist"><ul type="disc">
<li>
BOOST_COMMON_TYPE_USES_STATIC_ASSERT: define it if you want to use Boost.StaticAssert
</li>
<li>
BOOST_COMMON_TYPE_USES_MPL_ASSERT: define it if you want to use Boost.MPL
static asertions
</li>
</ul></div>
<p>
The default behavior is to use mpl assertions in this case, but setting BOOST_COMMON_TYPE_USES_STATIC_ASSERT
may reduce compile times and header dependencies somewhat.
</p>
<p>
Depending on the static assertion used you will have an hint of the failing
assertion either through the symbol or through the text.
</p>
<p>
When possible common_type is implemented using <code class="computeroutput"><span class="identifier">decltype</span></code>.
Otherwise when BOOST_COMMON_TYPE_DONT_USE_TYPEOF is not defined it uses Boost.TypeOf.
</p>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2006 Adobe Systems Inc, David Abrahams,
Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant, Jesse Jones, Mat
Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten Ottosen, Robert
Ramey and Jeremy Siek<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_typetraits.reference.copy_cv"></a><a class="link" href="copy_cv.html" title="copy_cv">copy_cv</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">copy_cv</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <em class="replaceable"><code>see-below</code></em> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
<span class="bold"><strong>type:</strong></span> <code class="literal">T <span class="emphasis"><em>cv</em></span></code>,
where <span class="emphasis"><em>cv</em></span> are the cv-qualifiers of <code class="computeroutput"><span class="identifier">U</span></code>.
</p>
<p>
<span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
<span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">copy_cv</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
<div class="table">
<a name="boost_typetraits.reference.copy_cv.examples"></a><p class="title"><b>Table&#160;1.17.&#160;Examples</b></p>
<div class="table-contents"><table class="table" summary="Examples">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Result Type
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">copy_cv</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">void</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">copy_cv</span><span class="special">&lt;</span><span class="keyword">int</span> <span class="keyword">const</span><span class="special">,</span> <span class="keyword">void</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span> <span class="keyword">const</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">copy_cv</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">void</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span> <span class="keyword">const</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">copy_cv</span><span class="special">&lt;</span><span class="keyword">int</span> <span class="keyword">volatile</span><span class="special">,</span> <span class="keyword">void</span>
<span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span> <span class="keyword">const</span>
<span class="keyword">volatile</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">copy_cv</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;,</span>
<span class="keyword">void</span> <span class="keyword">const</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">copy_cv</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">*,</span>
<span class="keyword">void</span> <span class="keyword">volatile</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span><span class="special">*</span>
<span class="keyword">volatile</span></code>
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break">
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<a name="boost_typetraits.reference.declval"></a><a class="link" href="declval.html" title="declval">declval</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">typename</span> <span class="identifier">add_rvalue_reference</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">declval</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span> <span class="comment">// as unevaluated operand</span>
</pre>
<p>
<span class="bold"><strong>C++ Standard Reference:</strong></span> C++11 20.2.4 [declval].
</p>
<p>
<span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
<span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">declval</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
<p>
The function template <code class="computeroutput"><span class="identifier">declval</span></code>
is used when a value of a certain type is required in a type computation
context. For example, the type of the result of adding an <code class="computeroutput"><span class="keyword">int</span></code>
and a <code class="computeroutput"><span class="keyword">float</span></code> can be obtained
with the expression <code class="computeroutput"><span class="keyword">decltype</span><span class="special">(</span> <span class="identifier">declval</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;()</span>
<span class="special">+</span> <span class="identifier">declval</span><span class="special">&lt;</span><span class="keyword">float</span><span class="special">&gt;()</span> <span class="special">)</span></code>.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">has_nothrow_destructor</span> <span class="special">:</span> <span class="keyword">public</span> <em class="replaceable"><code><a class="link" href="integral_constant.html" title="integral_constant">true_type</a>-or-<a class="link" href="integral_constant.html" title="integral_constant">false_type</a></code></em> <span class="special">{};</span>
</pre>
<p>
<span class="bold"><strong>Inherits:</strong></span> If T is a (possibly cv-qualified)
type with a non-throwing destructor then inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>,
otherwise inherits from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>.
Type <code class="computeroutput"><span class="identifier">T</span></code> must be a complete
type.
</p>
<p>
<span class="bold"><strong>Compiler Compatibility:</strong></span> Either requires
C++11 <code class="computeroutput"><span class="keyword">noexcept</span></code> and <code class="computeroutput"><span class="keyword">decltype</span></code> or else some (unspecified) help from
the compiler. You may test to see if the necessary support is available by
checking to see if <code class="computeroutput"><span class="special">!</span><span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_NO_CXX11_DECLTYPE</span><span class="special">)</span> <span class="special">&amp;&amp;</span> <span class="special">!</span><span class="identifier">defined</span><span class="special">(</span><span class="identifier">BOOST_NO_CXX11_NOEXCEPT</span><span class="special">)</span></code> is true.
</p>
<p>
<span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
<span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">has_nothrow_copy</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
Note that destructors are assumed to be non-throwing unless they are explicitly
marked otherwise with a <code class="computeroutput"><span class="keyword">throw</span><span class="special">(</span><span class="identifier">something</span><span class="special">)</span></code> specification. This is in line with the
C++11 standard.
</p></td></tr>
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<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">is_assignable</span> <span class="special">:</span> <span class="keyword">public</span> <em class="replaceable"><code><a class="link" href="integral_constant.html" title="integral_constant">true_type</a>-or-<a class="link" href="integral_constant.html" title="integral_constant">false_type</a></code></em> <span class="special">{};</span>
</pre>
<p>
<span class="bold"><strong>Inherits:</strong></span> If <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">declval</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;()</span>
<span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">declval</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;()</span></code>
then inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>,
otherwise from __flase_type. Type <code class="computeroutput"><span class="identifier">T</span></code>
must be a complete type.
</p>
<p>
Note that this trait is somewhat tricky to use correctly: for example:
</p>
<pre class="programlisting"><span class="identifier">is_assignable</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">value</span>
</pre>
<p>
is <code class="computeroutput"><span class="keyword">false</span></code> since <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">declval</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;()</span></code>
is an <span class="emphasis"><em>xvalue</em></span> which can not be assigned to!
</p>
<p>
If you're intention is to check for copy-assignment from some type U then
use:
</p>
<pre class="programlisting"><span class="identifier">is_assignable</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&amp;,</span> <span class="keyword">const</span> <span class="identifier">U</span><span class="special">&amp;&gt;::</span><span class="identifier">value</span>
</pre>
<p>
If you're intention is to check for move-assignment then use:
</p>
<pre class="programlisting"><span class="identifier">is_assignable</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&amp;,</span> <span class="identifier">U</span><span class="special">&amp;&amp;&gt;::</span><span class="identifier">value</span>
</pre>
<p>
or simply:
</p>
<pre class="programlisting"><span class="identifier">is_assignable</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&amp;,</span> <span class="identifier">U</span><span class="special">&gt;::</span><span class="identifier">value</span>
</pre>
<p>
<span class="bold"><strong>Compiler Compatibility:</strong></span> Requires the C++11
features <code class="computeroutput"><span class="keyword">decltype</span></code> and SFINAE-expressions
for full support.
</p>
<p>
<span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
<span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">is_assignable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span><span class="special">...</span> <span class="identifier">Args</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">is_constructible</span> <span class="special">:</span> <span class="keyword">public</span> <em class="replaceable"><code><a class="link" href="integral_constant.html" title="integral_constant">true_type</a>-or-<a class="link" href="integral_constant.html" title="integral_constant">false_type</a></code></em> <span class="special">{};</span>
</pre>
<p>
<span class="bold"><strong>Inherits:</strong></span> If <code class="computeroutput"><span class="identifier">T</span></code>
can be constructed from <code class="computeroutput"><span class="identifier">Args</span></code>,
then inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>,
otherwise inherits from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>.
Type <code class="computeroutput"><span class="identifier">T</span></code> must be a complete
type.
</p>
<p>
Formally the trait answers the question, is the expression:
</p>
<pre class="programlisting"><span class="identifier">T</span> <span class="identifier">t</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">declval</span><span class="special">&lt;</span><span class="identifier">Args</span><span class="special">&gt;()...);</span>
</pre>
<p>
valid?
</p>
<p>
There are a number of important special cases for this trait:
</p>
<pre class="programlisting"><span class="identifier">is_constructible</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">value</span>
</pre>
<p>
Indicates whether <code class="computeroutput"><span class="identifier">T</span></code> is default
constructible, while:
</p>
<pre class="programlisting"><span class="identifier">is_constructible</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">T</span><span class="special">&amp;&gt;::</span><span class="identifier">value</span>
</pre>
<p>
Indicates whether <code class="computeroutput"><span class="identifier">T</span></code> is copy-constructible,
and:
</p>
<pre class="programlisting"><span class="identifier">is_constructible</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">value</span>
</pre>
<p>
Indicates whether <code class="computeroutput"><span class="identifier">T</span></code> is move-constructible.
</p>
<p>
<span class="bold"><strong>Compiler Compatibility:</strong></span> This trait requires
the C++11 features <code class="computeroutput"><span class="keyword">decltype</span></code>
variadic templates and SFINAE-expression support for full support. While
there is some fallback code for cases where this is not the case, the trait
should really be considered broken in that case.
</p>
<p>
<span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
<span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">is_copy_constructible</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<a name="boost_typetraits.reference.is_default_constructible"></a><a class="link" href="is_default_constructible.html" title="is_default_constructible">is_default_constructible</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">is_default_constructible</span> <span class="special">:</span> <span class="keyword">public</span> <em class="replaceable"><code><a class="link" href="integral_constant.html" title="integral_constant">true_type</a>-or-<a class="link" href="integral_constant.html" title="integral_constant">false_type</a></code></em> <span class="special">{};</span>
</pre>
<p>
<span class="bold"><strong>Inherits:</strong></span> If <code class="computeroutput"><span class="identifier">T</span></code>
can be default-constructed then inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>,
otherwise inherits from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>.
Type <code class="computeroutput"><span class="identifier">T</span></code> must be a complete
type.
</p>
<p>
<span class="bold"><strong>Compiler Compatibility:</strong></span> This trait requires
the C++11 feature <code class="computeroutput"><span class="keyword">decltype</span></code> support
for full support. While there is some fallback code for cases where this
is not the case, the trait should really be considered broken in that case.
</p>
<p>
<span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
<span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">is_copy_constructible</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<a name="boost_typetraits.reference.is_destructible"></a><a class="link" href="is_destructible.html" title="is_destructible">is_destructible</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">is_destructible</span> <span class="special">:</span> <span class="keyword">public</span> <em class="replaceable"><code><a class="link" href="integral_constant.html" title="integral_constant">true_type</a>-or-<a class="link" href="integral_constant.html" title="integral_constant">false_type</a></code></em> <span class="special">{};</span>
</pre>
<p>
<span class="bold"><strong>Inherits:</strong></span> If <code class="computeroutput"><span class="identifier">T</span></code>
does not have its destructor deleted then inherits from <a class="link" href="integral_constant.html" title="integral_constant">true_type</a>,
otherwise inherits from <a class="link" href="integral_constant.html" title="integral_constant">false_type</a>.
Type <code class="computeroutput"><span class="identifier">T</span></code> must be a complete
type.
</p>
<p>
<span class="bold"><strong>Compiler Compatibility:</strong></span> This trait requires
the C++11 features <code class="computeroutput"><span class="keyword">decltype</span></code>
and SFINAE-expression support for full support. While there is some fallback
code for cases where this is not the case, the trait should really be considered
broken in that case.
</p>
<p>
<span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
<span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">is_copy_constructible</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
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<a name="boost_typetraits.reference.type_identity"></a><a class="link" href="type_identity.html" title="type_identity">type_identity</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">type_identity</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">T</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<p>
<span class="bold"><strong>Header:</strong></span> <code class="computeroutput"> <span class="preprocessor">#include</span>
<span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">type_identity</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
</p>
<div class="table">
<a name="boost_typetraits.reference.type_identity.examples"></a><p class="title"><b>Table&#160;1.33.&#160;Examples</b></p>
<div class="table-contents"><table class="table" summary="Examples">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Result Type
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">type_identity</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">type_identity</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span><span class="special">&amp;</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">type_identity</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">*</span> <span class="keyword">const</span><span class="special">&amp;&gt;::</span><span class="identifier">type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">int</span><span class="special">*</span>
<span class="keyword">const</span><span class="special">&amp;</span></code>
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break">
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2000, 2011 Adobe Systems Inc, David Abrahams,
Frederic Bron, Steve Cleary, Beman Dawes, Aleksey Gurtovoy, Howard Hinnant,
Jesse Jones, Mat Marcus, Itay Maman, John Maddock, Alexander Nasonov, Thorsten
Ottosen, Roman Perepelitsa, Robert Ramey, Jeremy Siek, Robert Stewart and Steven
Watanabe<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
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@ -23,7 +23,7 @@
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<a name="id1057128"></a>Index</h2></div></div></div>
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<div class="variablelist"><dl class="variablelist">
<dt>
@ -204,6 +204,10 @@
</dt>
<dd><div class="index"><ul class="index" style="list-style-type: none; ">
<li class="listitem" style="list-style-type: none">
<p><span class="index-entry-level-0">check</span></p>
<div class="index"><ul class="index" style="list-style-type: none; "><li class="listitem" style="list-style-type: none"><p><a class="link" href="../boost_typetraits/category/value_traits/operators.html" title="Operator Type Traits"><span class="index-entry-level-1">Operator Type Traits</span></a></p></li></ul></div>
</li>
<li class="listitem" style="list-style-type: none">
<p><span class="index-entry-level-0">common_type</span></p>
<div class="index"><ul class="index" style="list-style-type: none; ">
<li class="listitem" style="list-style-type: none"><p><span class="bold"><strong><a class="link" href="../boost_typetraits/reference/common_type.html" title="common_type"><span class="index-entry-level-1">common_type</span></a></strong></span></p></li>
@ -852,6 +856,7 @@
<p><span class="index-entry-level-0">Operator Type Traits</span></p>
<div class="index"><ul class="index" style="list-style-type: none; ">
<li class="listitem" style="list-style-type: none"><p><a class="link" href="../boost_typetraits/category/value_traits/operators.html" title="Operator Type Traits"><span class="index-entry-level-1">any</span></a></p></li>
<li class="listitem" style="list-style-type: none"><p><a class="link" href="../boost_typetraits/category/value_traits/operators.html" title="Operator Type Traits"><span class="index-entry-level-1">check</span></a></p></li>
<li class="listitem" style="list-style-type: none"><p><a class="link" href="../boost_typetraits/category/value_traits/operators.html" title="Operator Type Traits"><span class="index-entry-level-1">dont_care</span></a></p></li>
<li class="listitem" style="list-style-type: none"><p><a class="link" href="../boost_typetraits/category/value_traits/operators.html" title="Operator Type Traits"><span class="index-entry-level-1">has_equal_to</span></a></p></li>
<li class="listitem" style="list-style-type: none"><p><a class="link" href="../boost_typetraits/category/value_traits/operators.html" title="Operator Type Traits"><span class="index-entry-level-1">has_operator</span></a></p></li>